Final answer:
Option B, which includes muscle cramps, fatigue, and lightheadedness, accurately describes signs of heat exhaustion. It's crucial to quickly treat these symptoms by cooling down and rehydrating to prevent further illness.
Step-by-step explanation:
Signs that may indicate heat exhaustion include a variety of symptoms such as muscle cramps, fatigue, and lightheadedness. This aligns with option B in the question provided. It's important to recognize these signs as heat exhaustion can lead to a more severe condition known as heat stroke. When the body loses excessive electrolytes and water due to factors such as prolonged physical activity, high temperatures, or both, these symptoms may surface. Treatments include moving to a cooler environment, staying hydrated, and in some cases, consuming sports drinks to replenish electrolytes quickly and effectively.